when there is cause, there is effect. Life’s sorrows and joys, separations and reunions, in fact, all phenomena come with their own respective causes. Some we can see, some cannot. Only very special kind of persons can grasp the whole picture. But cause and effect always go hand in hand, never alone. No cause, no effect, and vice versa. If one is in pursuit of happiness, one must sow happiness to reap happiness. The seed of happiness is virtuous action. To avoid suffering and misfortune, one must not give rise to their causes. The cause of suffering is doing evil. Being foolish and ignorant, ordinary people try to reap happiness by sowing suffering. For example, nowadays many people try to prolong their own lives by killing and eating all sorts of animals. Aren’t the means and the purpose completely contradictory to one another?

- Quote from The Right View, "On Cause and Effect"